If we don't then it can lead to ear infection and the infection can then find its way into the the ear canal which cause you to be unbalance and very sick and cause all sorts of problems . If your talking about animals, then the vets bill can be costly too. Hearing is very important, so if we don't take care, so, please take care by regular cleaning with a soft cotton bud or use a gently ear cleaner of drops into he ear at least two to three times a week or daily if you wish.